Where are the world's oldest rocks?

Question:

Answer: Australia. The world's oldest terrestrial material, a tiny grain of zircon crystal. Measuring little more than two human hairs in diameter, the tiny grain of zircon crystal was found in the Jack Hills region of Australia and is estimated at 4.4 billion years old. It was dated by Simon Wilde, a professor in the School of Applied Geology at Curtin University of Technology in Perth, Western Australia.

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